Religion Online
Large collection of articles on the Old and New Testament, theology, ethics, pastoral care, counseling, homiletics, worship, missions, and religious education.
http://www.religion-online.org/

The Biblicist
Articles, reference materials, book recommendations, commentaries, and email answers to questions.
http://www.biblicist.org/

Creeds of Christendom
Creeds and Confessions of various Christian denominations.
http://www.creeds.net/

Systematic Theology
Presents a number of articles on a wide array of topics from various conservative/evangelical authors.
http://www.leaderu.com/menus/systematic.html

BasicTheology.com
Concise definitions of theological terms and positions, customizable charts comparing viewpoints, and in-depth articles.
http://www.basictheology.com/

Fundamental Baptist Institute
Presents a wide variety of topical Christian articles by numerous authors.
http://www.fbinstitute.com/

The Biblical Theology Briefings
Collection of original theological articles intended as a resource for preaching and teaching the Bible. Weblog and additional resources and recommendations.
http://www.beginningwithmoses.org/

Coalition on Revival
A network of evangelical leaders from different denominational and theological perspectives who share a vision for and commitment to revival, renewal, and reformation of the Church and society. Presents a series of well-researched theological papers.
http://www.angelfire.com/ca4/cor/index.html

Christian Classics Ethereal Library
Extensive collection of classic theological works from all periods of church history.
http://ccel.org/

Creeds of the Churches
John H. Leith, Editor. A reader in Christian doctrine from the Bible to the present. Viewing full text requires subscription.
http://www.questia.com/PM.qst?a=o&d=9894102

Theology.me.uk
Theology discussion forums, articles and news.
http://www.theology.me.uk/

The Trinity Foundation
Articles, books, tapes and resources on Reformed Christianity.
http://www.trinityfoundation.org/

Protestantism
Discussion on Protestant beliefs and doctrines from the Catholic Encyclopedia.
http://www.newadvent.org/cathen/12495a.htm

Philosophy and Religion
Edited by Dr. R. T. Nolan. Issues in philosophy, theology, biblical thought, and ethics, and papers by Cherbonnier and Kirkpatrick.
http://www.philosophy-religion.org/

Christian Theological Research Fellowship
The CTRF is a Christian research organization in systematic and moral theology, and related disciplines. The site contains the Journal for Christian Theological Research - a peer-reviewed scholarly e-journal of Systematic Theology Group of the American Academy of Religion.
http://www.luthersem.edu/ctrf/

Dignoscentia
Contains articles, recommended books, posters, Bible search tools, and a forum.
http://www.dignoscentia.com/

Grace Online Library
Authors and resources from the historic Reformed, Calvinistic and Puritan persuasion.
http://www.graceonlinelibrary.org/

European Society of Catholic Theology (ESCT)
Encouraging the communication, promotion and support of theological education, research, and services. Publishes a journal twice a year, Bulletin ET.
http://www.kuleuven.be/eurotheo/

Radical Faith
"Exploring fundamentals of faith in a changed world." Emphasis on non-traditional theological ideas. Sermons, responses to common questions, layman's guide to theological terms, book reviews, and other resources.
http://homepages.which.net/~radical.faith/

Theology Resources
Guide to articles, papers and other theological resources. Developed by the Virtual Private Library
http://theologyresources.blogspot.com/

VincentCheung.com
Downloadable PDF books on theology, Bible commentary, apologetics, philosophy, and spirituality.
http://www.vincentcheung.com/

Theos Think Tank
A public theology think tank providing alternative perspectives to secular culture and public opinion. Reports, consultancy, events, and news.
http://www.theosthinktank.co.uk/